Couple of questions from a newbieSupport

I am getting the Backflip. It is my first Android phone. I dont care about the 1.5 OS, but I have some questions:

1. GPS: With the GPS in it, are there any apps that use GPS-only, and it the Tom-Tom app worth it?

2. Constant Streaming of Data: When I tried it out in the store, it was roaming for data. When I turned that option off, it said to turn it on, it would cost a lot of money. I am getting the smaller 200 Mb plan, will that suffice for occassional Twitter and weather checks? Most of the time will be with Wifi.

For now there are no free apps that do not use data and GPS; they are free becasue you do not get to download the maps. I personally like iGo; but there is also copilot. They do cost, but you download the maps to your memory card, so you can have the phone competly disconnected from data, with GPS on, and get turn by turn directions.

As for data, download quick settings, there is an apn or mobile data button that will disable data 100%

Copliot is a one time charge and not a monthly fee, plus you need to download the maps as well (2GB file, so use Wifi); but it does not come with updates to the maps. iGo is simular (what I prefer), but since it is not available in the market it is harder to find. But if you search for "igo for android" on google, you should be able to find what you are looking for.